Abstract
In each of the poly(vinyl methyl ether)-polystyrene-toluene and poly(vinyl methyl ether)-polystyrene-CCl 4 systems studied, the poly(vinyl methyl ether) (PVME) is approximately isorefractive with the solvent and the polystyrene (PS) is present only as a trace. The results of our experiments on PVME-PS-toluene solutions agree with previous work, giving-the self-diffusion coefficient of the PS. However, a change of solvent from toluene to CCl 4 produces much lower values for the effective diffusion coefficients. It is concluded that the true self-diffusion coefficient is no longer measured by this technique due to the solvent being of good quality for one polymer but only marginal for the other
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